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Date:   Fri, 24 Apr 2020 16:07:07 +0200
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, sameehj@...zon.com
Cc:     Toshiaki Makita <toshiaki.makita1@...il.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org, zorik@...zon.com,
        akiyano@...zon.com, gtzalik@...zon.com,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        David Ahern <dsahern@...il.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Saeed Mahameed <saeedm@...lanox.com>,
        steffen.klassert@...unet.com
Subject: Re: [PATCH net-next 10/33] veth: xdp using frame_sz in veth driver

Jesper Dangaard Brouer <brouer@...hat.com> writes:

> The veth driver can run XDP in "native" mode in it's own NAPI
> handler, and since commit 9fc8d518d9d5 ("veth: Handle xdp_frames in
> xdp napi ring") packets can come in two forms either xdp_frame or
> skb, calling respectively veth_xdp_rcv_one() or veth_xdp_rcv_skb().
>
> For packets to arrive in xdp_frame format, they will have been
> redirected from an XDP native driver. In case of XDP_PASS or no
> XDP-prog attached, the veth driver will allocate and create an SKB.
>
> The current code in veth_xdp_rcv_one() xdp_frame case, had to guess
> the frame truesize of the incoming xdp_frame, when using
> veth_build_skb(). With xdp_frame->frame_sz this is not longer
> necessary.
>
> Calculating the frame_sz in veth_xdp_rcv_skb() skb case, is done
> similar to the XDP-generic handling code in net/core/dev.c.
>
> Cc: Toshiaki Makita <toshiaki.makita1@...il.com>
> Reviewed-by: Lorenzo Bianconi <lorenzo@...nel.org>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>

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